JP4131307B2 - Method for manufacturing tube for electrophotographic photosensitive drum substrate - Google Patents

Description

【００１３】
【発明の効果】
本発明は、電子複写機 プリンター、ファクシミリなどの電子写真方式の出力機器に使用される特に振れ精度に優れた長尺感光ドラムのための基体用管体及びその製造方法に関する。
本発明による時は、得られる感光ドラム基体用管体は、長尺感光ドラムに使用しても振れ精度が小さく、出力画像の高画質化の要望に応えることができるものである。該基体用管体は材質的にも高速度の切削、大きい切込量を取ることができ、仕上げ面の品位や精度を高く確保できることから、収率９０％以上で長さ Ｌ＞３００ｍｍの長尺で表面平滑性に優れ、振れ精度が振れ≦Ｌ／５μｍの電子写真方式出力機器用の感光ドラムを製造できるものである。
【図面の簡単な説明】
【図１】 切削用の管材を製造する引抜き加工機の断面図。
【図２】 引抜管の残留応力による影響、定寸切断した試験片の切り離した時の形状。
【図３】 残留応力による切削への影響。
【符号の説明】
Ａ 押出素管
Ｂ 引抜ダイス
Ｃ 引抜プラグ
Ｄ 引抜管[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a drum base tube for a large-sized photosensitive drum excellent in shake accuracy, used for an electrophotographic output device such as an electrocopier, a printer, and a facsimile, a manufacturing method thereof, and an electrophotographic output device. The present invention relates to a method for manufacturing a photosensitive drum for an automobile.
[0002]
[Prior art]
In recent years, with the rapid progress of office equipment such as copiers and personal computers, new office processing technology has been developed, office processing time has been shortened, office departments have been greatly streamlined, and labor-saving has been carried out. In the progress of processing, the contribution of electrophotographic output devices such as electronic copying machines and printers is significant.
OPC photosensitive drums used in these electrophotographic output devices are often provided with an OPC photosensitive member using an outer peripheral surface of an aluminum tube or an aluminum alloy tube as a base. The photoreceptor includes a single layer type and a laminate type, and undercoating and the like are performed as necessary. However, a tubular body as a coating substrate is required to have high dimensional accuracy and surface smoothness.
Aluminum tubular bodies are usually formed by forming methods such as cutting, ironing, and drawing, but in many cases when particularly severe surface smoothness (for example, surface roughness is Ry ≦ 1.5 μm) is required. A cutting method is used.
[0003]
In recent years, there is an increasing demand for large-sized output of A3 size, B4 size or larger in commercial copying machines, printers, etc., and the necessity of a long photosensitive drum exceeding the length L = 300 mm is increasing.
On the other hand, with increasing demands for higher output image quality, higher printing speed, etc., high dimensional accuracy is required, especially for tube length of drum length L (mm), There has been a demand for photosensitive drums with extremely small runout. If this is manufactured by a conventional cutting method, the runout becomes large and stable production becomes difficult.
[0004]
[Problems to be solved by the invention]
The present invention has high runout accuracy that can be used for a long photosensitive drum for an electrophotographic output device, can meet the demand for higher image quality of an output image, and can perform high-speed cutting and a large depth of cut. An object of the present invention is to develop a method of manufacturing a photosensitive drum substrate tube made of a material capable of ensuring high quality and accuracy of the finished surface.
[0005]
[Means for Solving the Problems]
The present invention
[1] After an aluminum alloy tube is formed by drawing or ironing an Al—Mg—Si based aluminum alloy, the residual stress is released by heat treatment at a temperature of 135 to 300 ° C. for 10 to 180 minutes, and then cutting is performed. A method of manufacturing an aluminum alloy tube characterized by length L> 300 (mm) by processing, surface roughness Ry ≦ 1.5 μm, runout ≦ L / 5 (μm), and [2] Al A method for producing a photosensitive drum for an electrophotographic output device, characterized in that an aluminum alloy cutting tube produced by the method described in [1] above using JIS6063 alloy as the Mg—Si based aluminum alloy is used. The above objectives were achieved through development.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
The present invention is an Al—Mg—Si-based aluminum alloy (6000-based aluminum alloy), particularly preferably JIS 6063 not only in extrudability but also in cutting (ease of processing, quality of finished surface and dimensional error). It was found that the material can meet the requirements of
[0007]
When manufacturing a photosensitive drum using the above material (Al-Mg-Si-based aluminum alloy), if the drum length is short, the residual stress has little adverse effect on the shake even with the drawing process alone, but this exceeds 300 mm. In terms of length, the shake is inevitably large when used as a product photosensitive drum, and when a photosensitive drum with a small shake is intended, the product yield is low and stable production is difficult.
In the present invention, as a long photosensitive drum used in a large output device, a photosensitive material having both higher surface smoothness (surface roughness Ry ≦ 1.5 μm) and higher runout accuracy (runout ≦ L / 5 μm) than conventional ones. The production conditions for the drum base tube have been developed.
[0008]
In the drawing process, as shown in FIG. 1, the drawing tube D is formed by using a drawing device composed of a drawing die B and a drawing plug C.
When the drawn tube D thus formed is cut as it is, the ease of processing, the quality of the finished surface, the dimensional error, etc. can sufficiently achieve the target values, but the length L (mm) is As the length increases, the deflection increases. When the length L exceeds 300 mm, it is extremely difficult to achieve the deflection ≦ L / 5 (μm).
It is estimated that this is because the cutting tube is bent at the time of cutting, so that uniform cutting cannot be performed, and therefore the cut piece is bent due to residual stress when cut at a constant size as shown in FIG. .
That is, as shown in FIG. 2, a ring-shaped test piece is prepared with the convex side of the pipe bent by drawing (which may be unidentifiable because it looks like a straight pipe) with the convex side up and the concave side down. When cutting out and separating the test piece at the top (1), side (2, 3), and bottom (4) to make it C-shaped and releasing the residual stress, the width d has a tendency, and there is a variation in the circumferential direction. It was confirmed that there was.
[0009]
The reason why the runout accuracy could not be reduced if the drawn tube was cut as it was could not be clearly analyzed, but when cutting a drawn tube with residual stress, the circumferential residual stress was non-uniform as shown in FIG. It is bent when the drawn tube is cut for cutting, or the residual stress of the cutting part is partially released as the surface part is cut by cutting, and a convex part and a concave part are newly developed, In order to further smooth this by cutting, it is considered that partial non-uniformity may occur.
When such a drawn tube is cut as it is, the thickness becomes non-uniform in the length direction of the tube as shown in 2 of FIG.
Residual stress has a complicated distribution and is considered to have a very complicated effect on runout accuracy in relation to the residual stress and the difference in yield strength associated with the difference in tube thickness.
[0010]
Therefore, it is absolutely necessary that the drawn pipe is cut after the residual stress is completely released before machining.
In order to release such a complicated residual stress of the drawn tube, if the heat treatment is performed at 135 ° C. to 300 ° C., preferably 145 ° C. to 220 ° C. for 10 to 180 minutes, the residual stress of the cutting tube is ensured. Thus, even if it is a long drawn tube, the deflection accuracy of the tube for the substrate can be made extremely small.
When the heat treatment temperature is less than 135 ° C., the effect of releasing the residual stress is small, and when heat treatment exceeding 300 ° C. is performed, the machinability is deteriorated. Further, when the heat treatment time is less than 10 minutes, there is a large variation in the release of residual stress, and the treatment for a time exceeding 180 minutes does not particularly improve the effect and merely reduces the productivity.
[0011]
【Example】
An Al—Mg—Si based aluminum alloy pipe (JIS 6063 alloy) having a length of 350 mm, an outer diameter of 30 mm, and a thickness of 1.0 mm manufactured by the drawing method is heat-treated according to various conditions shown in Table 1, and its outer periphery. The surface was cut to manufacture 20 tubes having a surface roughness Ry ≦ 1.5 μm and runout ≦ L / 5 (μm) or less. Table 1 shows the machinability, average runout accuracy, and yield at that time.
For comparison, using the same aluminum alloy (JIS 6063) pipe and pure aluminum pipe (JIS 1100) as described above, heat treatment under the conditions shown in Table 1 is similarly performed as heat treatment conditions, and the outer peripheral surface is cut. A tube was produced. The machinability, average runout accuracy and yield are shown.
[0012]
[Table 1]

[0013]
【The invention's effect】
The present invention relates to a tube body for a substrate for a long photosensitive drum which is particularly excellent in shake accuracy used in an electrophotographic output device such as an electrocopier, a printer, and a facsimile, and a method for manufacturing the same.
When the present invention is used, the obtained photosensitive drum substrate tube has a low shake accuracy even when used for a long photosensitive drum, and can meet the demand for higher image quality of output images. The base tube can be cut at a high speed in terms of material, can take a large depth of cut, and can ensure a high quality and accuracy of the finished surface. Therefore, the length L > 300 mm is obtained with a yield of 90% or more. A photosensitive drum for an electrophotographic output device having a scale and excellent surface smoothness and having a shake accuracy of ≦ L / 5 μm can be produced.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a drawing machine that manufactures a tube material for cutting.
[Fig. 2] Influence of the residual stress of the drawn tube, and the shape when the test piece cut at a fixed size is cut off.
Fig. 3 Influence on cutting by residual stress.
[Explanation of symbols]
A Extrusion tube B Drawing die C Drawing plug D Drawing tube

Claims (2)

After drawing or ironing an Al—Mg—Si based aluminum alloy to form an aluminum alloy tube, heat treatment is carried out at a temperature of 145 to 220 ° C. for 10 to 180 minutes to release the residual stress. A method for producing an aluminum alloy tube for a photosensitive drum substrate, wherein L> 300 (mm), surface roughness Ry ≦ 1.5 μm, and deflection ≦ L / 5 (μm).   A method for producing a photosensitive drum for an electrophotographic output device, comprising using an aluminum alloy cutting tube produced by the method according to claim 1 using JIS6063 alloy as an Al-Mg-Si aluminum alloy.

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